Knock-over-bit mechanism for knitting-machines.



M. ZWICKY. KNOCK-OVER BIT MECHANISM FOR KNITTING MACHINES.

APPLICATION ElLED DEC. 27. 19 13.

Patented Aug. 17, 1915.

2 suns-sum I.

M. ZWICKY. KNOCK-OVER BIT MECHANISM FOR KNITTING MACHINES.

. APPLICATION FILED DEC-27, I9|3- Llfifififi? Patented Aug.- 17, 1915.

2 SHE'ETSSHEET 2.

M51072?!" Zmrky,

UNITE STATS PATENT @FFTQE.

I MELGHIOR ZWICKY, OF WYOMISSING, PENNSYLVANIA, ASSIGNOR T0 TEXTILEMACHINE WORKS, 015 WYOMISSING, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

KNOCK-OVER-IBIT MECHANISM FOE KNITTING-MACHINES.

Specification of Letters lPatent.

- Patented Aug. 17, 19.15.

Application filed December 27, 1913. Serial No. 808,932.

ToaZZ whom it may concern Be it knownthat I, MELCHIOR ZWICKY, a citizenof the United States, residing at Wyomissing, in the nounty of Berks andState of Pennsylvania, have invented certain new and useful Improvementsin Knockagainst objectionable slackening of the yarn during formation ofthe loops, and thereby improve the quality of the knitted fabric. Suchslackening is ordinarilyincident particularly to the freeing of theloops by the action of the knoek-over-bits, and effort has heretoforebeen made to overcome this by intermittently shifting the latterrelative to the loop forming devices. My invention provides an improvedmechanism for this purpose as hereinafter fully described.

Figure 1 is a cross-sectional view showing my improved mechanism appliedin preferred manner to a straight knitting machine of ordinaryconstruction. Fig. 2'is a corresponding partial plan view. Figs. 3, hand5 are enlarged cross-sectional'views showing the pivotally carriedknock-over bit bed in several positions assumed during operation of themachine, with corresponding positions "of the cooperating sinkers anddividers.

Figs. 6, 7,-and 8 are separateviews of the fixed sinker-and-divider bed;and Figs. 9, 10, and 11 are'separate views of the rockably ordinarystraight knitting machine as are necessary to a showing of my improvedknock-over-bit mechanism in connection therewith; the usual cam-shaft 2being indicated as the means through which the required intermittentrocking movement is impartedto my pivotally mounted knock-overbitcarrier bed 3, and the machine frame 4 as the support for mypivot-bearing sinkerand-divider .bed attachment, and for the vrocking-lever mechanisinemployed.

The pivot-bearing attachment, as shown,

comprises a longitudinally extending sinkerand-divider bed 10, in whichthe usual transversely-movable sinkers and dividers 11 and 12 aremounted; and end bearing lugs 13 in which is rockably mounted theknock-overbit carrier bed 3. The latter has end bearing arms 14, 14.engaged in said bearing lugs 13,

and the projecting end of one of these arms, 14, has a depending lever15 fixed thereto through which a rocking movement is imparted to thecarrier bed 3 as hereinafter described. The series of knock-over'bits 16is fixed to the carrier bed so that their extend-- ed end portions standnormally at an angle of approximately forty-five degrees to the pivotalcenter of the carrier bed, and are adapted to swing in an are 17 towardand away from thetransversely moving sinkers and'dividers with whichthey cooperate in the knitting operation. The bed 10 is fixedly securedto the-machine frame by means of bolts 18 as indicated, and the sinkerand dividers mounted therein are operated as usual. The pivot-bearinglugs 13 of the attachment v5 depend from the end portions of thesinkerand divide'r bed 10 thereof, and form in connection with thedetachable bearing caps 20, pivot bearings the centers of which arelocated under the sinkers and dividers and Well inside of theextremities of the latter as indicated: so that the knock-over bits r16, which are secured in the pivotal carrier bed 3, are swung by therocking of the latter to varying-cooperating positions relative to thesinkers and dividers 11-12, as hereinafter described in connection withFigs. 3, 4t, and 5.

The lever mechanism employed to transmit the desired rocking movementsto each carrier-bed 3 and its series of knock-overbits 16, comprises acam-contacting lever 25 which is held in "eontact by a spring 26, withthe periphery of a cam disk 27 or 27', having a projection 28, or 28,which imparts a determined swing to said lever during a determinedportion of the'regular r0- tation of camshaft 2. This swing istransmitted through a link 30 to a rock-shaft 31 having arms 32' and 33,the latter of which is connected by a link 34 to the fixed arm 15 .onthe carrier bed 3, thereby rocking the latter so as to swing .theknock-over bits to different positions desired relative to? the sinkersand dividers. As will hereaft'iggfurther appear these relatire positionsshould be varied to meet different conditions occurring; the knittingofla'dies? stockings for instance involving the use of a welting bar 'instarting the stocking and forming a 'double top or welt, whichnecessitates the practicable approach of the knock-over bits. for thefreeing of the loops. To accomplish this I employ the two cam disks 27and 27, the lever-swinging projections 28, 28 of which vary somewhat inheight and location, as indicated, so as to differently swing the lever25 as required; at the same time providing means for convenientlyshifting said lever to one or other of said cam disks. This meanscomprises, as shown, a" shifting lever 40 loosely pivoted at 41 to themachine frame so as to slide a shaft 42 having fixed thereto a shiftingfork 43 adapted to engage and shift the anti-friction roller 44 of thelever 25 to one or other of the cam disks as desired. 4

Several of the positions to which the. knock-over bits are swung atdifferent stages of the knitting operation, with relative positions ofthe sinkers and dividers, are indi catedin enlarged Figs. 3, 4, and 5.Fig. 3 indicates a maximum clearance between the sinkers and knock-overbits. Fig. 4 indicates a position when the welting bar is employed, thelever 25 being then in engagement with the cam disk 27 alesser rockingmovement is imparted to the knock-over bit carrier bed 3 when the camprojection. 28

to the sinkers than in Fig. 4, as is practicable during ordinaryknitting; the lever 25 being then in operating... engagement with thelarger cam projection 28- of disk 27. This pivotal swinging of theknock-over-bit bed 3 upon its bearings 14, 14 permits of always keepingthe rear hump of these bits as close as possible tothe forward end ofthe sinker-and-divider bed 10, against which the needle beards arepressed, as shown, while providing the varying clearances of the outerend of these bits 16 from the sinkers and dividers 11 and 12, for thebetter knocking off of the formed loops without undue slack.

lVhatI claim is V In a full fashioned knitting machine comprisingmovable needles, sinkers, and dividers; a frame-secured attachmentforming a sinker-and-divider bed and provided with bit-carrier bedbearings, a knock-over-bit carrier bed rockably mounted in saidbearings, and means for imparting an intermittent rocking movement tosaid carrier bed. V.

In testimony whereof I aiiix my signature in presence of two witnesses.I

" MELCHIOR ZWIGKY.

Witnesses:

D. W. STEWART, A. M. KURTZ.

